Valves
Characteristic | Meaning |
Eccentricity of valve stems relative to the working chamfer, no more than, mm | 0,03 |
Chamfer angle | 45° + 15' |
Minimum height of the valve head to the working chamfer M 102, not less than, mm | |
| 1,0 |
| 2,0 |
Valve specifications
Parameter, mm | Engine model | |||
M 115.938 | M 102.920, M 102.939 | M 102.980, M 102.982 | M 115.954 | |
Valve Face Width | ||||
| 1,8—2,5 | |||
| 1,5—2,5 | |||
Nominal head recess | ||||
| 0,5 | 1,7 | 1,2 | 0,1 |
| 1,6 | 1,6 | 0,5 | 1,6 |
Maximum allowable valve recess | ||||
| 1,5 | 2,6 | 2,1 | 0,9 |
| 1,7 | 1,7 | 1,4 | 1,7 |
Valve head diameter | ||||
| 44,30—44,10 | 39,90—40,10 | 39,90—40,10 | 47,10—46,90 |
| 37,25 | 35,90—36,10 | 37,25 | |
Valve head height | ||||
| 1,0 | 1,6 | 1,6 | 1,0 |
| 1,5 | 2,7 | 2,7 | 1,5 |
Valve stem diameter | ||||
| 8,948—8,970 | 7,970—7,955 | 8,955—8,970 | |
| 10,94—10,92 | 8,960—8,938 | 10,935—10,95 | |
Valve stem length | ||||
| 128,0 | 114,7—115,10 | 128 | |
| 132,2 | 115,60—116,00 | 132,20 | |
Parameter, mm | M 123.920, M 123.921 | M 110.923 | M 110.984, M 110.988 | |
Valve Face Width | ||||
| 1,8—2,5 | |||
| 1,5—2,5 | 1,5—2,0 | ||
Nominal head recess | ||||
| 0,5 | 3,3 | 3,3 | |
| 1,5 | 0,6 | 0,6 | |
Maximum allowable valve recess | ||||
| 1,5 | 4,2 | 4,2 | |
| 1,6 | 1,5 | 1,5 | |
Valve head diameter | ||||
| 41,30—41,10 | 45,10—45,30 | ||
| 37,00—37,20 | |||
Valve head height | ||||
| 1,0 | 1,0 | 1,0 | |
| 2,0 | |||
Valve stem diameter | ||||
| 8,955—8,970 | |||
| 10,935—10,95 | 10,94—10,96 | ||
Valve stem length | ||||
| 128 | 115,0 | ||
| 132,20 | 118,00 |
Valve springs
The intake and exhaust valves have one identical spring of models M 102 and M 123 and two springs of models M 110 and M 115. The valve springs of engines with adjustable clearances in the valve drive mechanism differ from the valve springs of engines with hydraulic clearance compensation. When reassembling, direct the color mark towards the valve spring seat.
Valve spring specifications
Note. Color marking: Cr. - red; F-B - violet-white; J-K - yellow-brown; F—Cr. - purple-red; J-B - yellow-white.
Engine model | |||
M 115.938 | M 102.920, M 102.939 | M 102.980, M 102.982 | M 115.954 |
Cr. |
| F—K/F—Cr. | Cr. |
M 123.920, M 123.921 | M 110.923 | M 110.984, M 110.988 | |
F—Cr. | — | — |
Spring diameter
Parameter, mm | Engine model | |||
M 115.938 | M 102.920, M 102.939 | M 102.980, M 102.982 | M 115.954 | |
Spring diameter | ||||
| 33,2—33,7 | 33,9 | 34,2 | 33,1—33,4 |
| 22,2 | — | — | 22,29 |
Spring wire diameter | ||||
| 4,3 | 4,6 | 4,75 | 4,25 |
| 2,5 | — | — | 2,5 |
Free spring diameter | ||||
| 50,0 | 48,5 | 49,0 | 50,0 |
| 45,0 | — | — | 45,0 |
Length and load of outer spring | ||||
length, mm / under load, kgf | 30,0/66,7—76,3 | 30,4/79,0—85,0 | 30,5/84,3—90,2 | 30,0/66,7—76,3 |
rated load, kgf | 60,9 | 71,0 | 76,0 | — |
Length and load of internal spring | ||||
length, mm / under load, kgf | 21,0/22,8—25,2 |
| — | 21,0/22,8—25,2 |
rated load, kgf | 20,5 |
| — | 20,5 |
Spring part number | ||||
| 1290530220 | — | — | 1290530320 |
| 1080530022 | — | — | 1080530022 |
Parameter, mm | M 123.920, M 123.921 | M 110.923 | M 110.984, M 110.988 | |
Spring diameter | ||||
| 34,1—34,5 | 33,8—34,1 | ||
| — | 22,0—22,4 | ||
Spring wire diameter | ||||
| 4,75 | 4,6 | 4,6 | |
| — | 2,5 | 2,5 | |
Free spring diameter | ||||
| 49,0 | 49,5 | ||
| — | 45,0 | ||
Length and load of outer spring | ||||
length, mm / under load, kgf | 30,5/86,0—92,0 | 30,5/84,0—92,0 | ||
rated load, kgf | 57,1 | — | — | |
Length and load of internal spring | ||||
length, mm / under load, kgf | — | 21,5/22,8—25,2 | ||
rated load, kgf | — | 20,5 | ||
Spring part number | ||||
| 1230530020 | 1180530120 | ||
| — | 1300530222 |
Valve rocker arms
Rocker arms are made of steel and are the same for intake and exhaust valves. The supporting surface of the rocker is subjected to surface hardening. The clearance between the rocker arm and the valve stem is adjusted by turning the adjusting screw with locknut or compensated hydraulically. The oil in the hydraulic pusher is supplied under pressure from the axle and rocker arms.
Characteristic | Meaning |
Inner diameter of the rocker axis, mm | 18,016—18,027 |
Rocker axle diameter, mm | 17,989—18,000 |
Radial clearance between rocker arm and axle, mm | 0,016—0,038 |
Diameter of the hole in the camshaft support for the rocker arm, mm | 18,000—18,018 |
Hydraulic pushers
Characteristic | Meaning |
Hydraulic compensation stroke, mm | 0,5—2,4 |
Thickness of adjusting washers, mm | 0,9; 1,5; 1,8; 2,2 |
Plate thickness, mm | 1,0; 1,5 |